KARCHER WT 5 Water Timer 2645219KARCHER WT 5 Water Timer Order No. 2. 645 219. 0 The Krcher WT 5 water timer has four selectable modes: automatic watering, manual watering, countdown watering, and 24 hour break. In automatic watering mode the WT 5 waters exactly as you wish at the programmed times with the previously set watering duration. The watering program can be activated for each day of the week and can run up to two cycles per day (morning and or evening). The maximum